[gnome-software] Do not crash if the child schema is invalid

[Richard Hughes <rhughes src gnome org>]

commit 0ac296260bd4018f67eae0c7f25e34ce66cdbd0a
Author: Richard Hughes <richard hughsie com>
Date:   Fri Aug 4 18:05:24 2017 +0100

    Do not crash if the child schema is invalid
    
    Will help to debug: https://bugzilla.gnome.org/show_bug.cgi?id=781905#c5

 src/gs-folders.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/gs-folders.c b/src/gs-folders.c
index ca5014e..a05e212 100644
--- a/src/gs-folders.c
+++ b/src/gs-folders.c
@@ -192,6 +192,10 @@ load (GsFolders *folders)
 
                child_path = g_strconcat (path, "folders/", ids[i], "/", NULL);
                settings = g_settings_new_with_path (APP_FOLDER_CHILD_SCHEMA, child_path);
+               if (settings == NULL) {
+                       g_warning ("ignoring folder child %s as invalid", ids[i]);
+                       continue;
+               }
                name = g_settings_get_string (settings, "name");
                translate = g_settings_get_boolean (settings, "translate");
                folder = gs_folder_new (ids[i], name, translate);